Compensating indicator mechanism.



A. A. BOWSER.

COMPENSATING INDICATOR MECHANISM. APPLICATION man NOV. 12. 1913.

Patented July 27, 1915.

3 SHEETSSHEET I.

A. A. BOWSER.

COMPENSATING INDICATOR MECHANISM.

APPLICATION FILED NOV. 12, 1913.

1,147,842. Patented July 27, 1915.

3 SHEETS-SHEET 2.

A. A. BOWSER.

COMPENSATING INDICATOR MECHANISM.

APPLICATION FILED NOV-12. 1913. LILQ I QPJ Patented July 27', 1915.

3 SHEETS-SHEET 3.

ALLEN A. nowsnn, on roar WAYNE, INDIANA.

COMPENSATING INDICATOR MECHANISM.

. Specification of Letters Patent.

Patented July 27, 1915.

Application filed November 12, 1918. Serial No. 800,447.

To all whom it may concern: I

Be it known that I, ALLEN A. Bowsnn, a citizen of the United States, residing at Fort Wa ne, in the county of Allen and State of. ndiana, have invented certain new and useful Improvements in Compensating Indicator Mechanism, of which the following is a specification.

My invention relates to compensating indicator mechanism and has for its primary object the provision of improved compensating indicator" mechanism by means of which a true indication of the work accomplished-by a machine may be had regardless of v'ariat1ons from standard of parts of'the machine.

lVith the above and other objects in view, this invention consists substantially in the combination, arrangement andmmlstruction of parts all as hereinafter more fully described, shown in the accompanying drawings, which form a part of this specification and show the preferred embodiment of my invention, and more particularly set forth in the subjoined claims.

Figure 1 is a front elevation of a pump with which my invention is incorporated and having a portion broken away; Fig. 2 is a'plan view of the pump shown in Fig. 1; Fig. 3 is a section taken on the line 3-3 of Fig. 2 and looking in the direction indicated by the arrows, the lower part of thepump 'being broken away; Fig. 4 is a front elevation of the pump illustrated in'Fig. 1 with portions broken away and showing a different position of the parts; Fig. 5 is a view of a portion of Fig. 4 showing a different position of the parts; Fig. 6 is an end elevation of a pin block forming part of my invention, and Fig. 7 is a section taken approximately on the line 7-7 of Fig. 6' and looking in the direction indicated by the arrows.

In certain machines, such for, instance, as the pump illustrated in the drawings, gradnations are placed upon a movable part of the machine and an indicator point is so positioned asto register with the graduations during the operation of the machine eating with the hollow interior of the block.

indication is not had of the amount of work 7 accomplished. My invention provides means for overcoming this ob ectio In the drawings, reference numeral 10 indlcates a reciprocating rack which receives power and operates the pump. In Fig. 1 the rack is shown in the position it assumes at the beginning of a dischargestroke of the pump, and in Figs. 1 and 5 the rack is shown in the position it assumes at the completion of its discharge stroke. In other words, the pump discharges during the upward stroke of the rack 10. Reference numeral 11 indicates a thin flat strip provided with graduations 12 and attached preferably to the outer side' of the rack .10. These graduations may be given any suitable designating legends, such for instance, as those shown in the drawings, beginning with zero and ending with 5, indicating that the discharge capacity of the pump is five gallons per stroke. The graduations 12 could, of course, be made upon the rack itself, but in manufacture it is customary to attach a member, such as the strip 11, marked with standard graduations. An indicator arm 13, provided with an indicating point 14, is mounted for oscillation intermediate its extremities upon a pivot pin 15 fixed to a frame 15 positioned upon the upper casing of the pump. The rear end of the indicator arm 13 or that end opposite the point 14 is slotted as at 16. The pump is provided with a drivingshaft 17 to which is keyed a driving pinion 18 in mesh with the rack 10, and in o eration power is applied to the driving shat 17 and communicated through the driving pinion 18 to the rack 10. Gear teeth 19 (see Figs. 2 and 3) are provided upon the driving shaft 17 adjacent the rearward face of the frame 15, and a train of gears 20, 21, 22 and-23 is connected to the gearteeth 19 for movement thereby. An 05- cillating arm24 is keyed upon an oscillating shaft 25 journaled in the frame 15, and is provided at its free end with a toothed segment 26 in mesh with a gear 23. A pin block 27 is keyed upon the forward end of the oscillatin shaft 25. This pin block (see Figs. '6 and is hollow and is internally threaded as at 28. It is also provided in its forward face with'a slot 29 communi- A traveling screw 30 engages the threads 28 7 of the block 27 and is provided with a drivshaft.

When the indicator arm 13 and the block 27 are in the position shown in Fig. 1, the f slots 16 and 29 register with each other and the indicating point 14 registers with the I graduation marked zero upon the stri 11.

In this position of the parts'both othe slots 16 and 29 extend on either side of the axis of the shaft 25. A threaded rod 33 is positioned upon the outside of the pump adjacent and parallel to the rack 10. Adjustable stops 34 and 35 are mounted upon the rod 33 and .a foot 36 secured to the lower end of the rack 10 coo crates with either'of the stops at the will 0 the operator to limit the upward or discharge movement of the rack 10. In the position of parts shown in Fig. 1 the stop 34 is in an inoperative position and. will not contact with the foot 36, whereas, the stop 35 is in operative position and will contact with the foot 36 when the rack 10 has reached the limit of its upward or discharge stroke. In the position of parts shown in Fig. 4 the rack 10 has reached the limit of its upward stroke and is prevented from further upward movement by contact with the stop 35. The adjustable 34 and 35 'and the rod 33 u on which stops they are mounted, together with t e foot 36 upon the rack 10, are described in detail as they appear on the particular pumpwith which my invention is shown here as incorporated, but they represent broadly any convenient device forlimiting the upward or discharge movement of the rack 10 when any predetermined amount of liquid has been dispensed from the pump. At 37 in Fig. 1 is indicated the intake for the pump, and the outlet is shown at 38.

.In considering the operation of my invention it is to be understood that the graduations 12 are normally of the standard type and equally spaced apart. These graduations may be placed upon such a pump, as is illustrated in the drawin s herewith and described in the spec' cation, or they may form a part of any other mechanism with which it is desired to incorporate my invention, and, in some mechanism other than the pump herein shown, it may be that the standard distances between the graduations 12 are different from the standard distances used in such a pump as is herein shown; nevertheless, for any particular mechanism the graduations 12 are to be considered asspaced a standard distance a art for that particular mechanism. Consi ering the pump then as the mechanism with which my invention is to be embodied in the present instance, the graduations 12 are a given distance from each other. Itfrequently happens that the pumping chamber of a pump varies slightly.

in internal dimensions which, of course, causes a, variation from standard in the dlS- larger than standard, the indicating point 14, if ri 'd, would, when an even five gallons ha been discharged'from the pump, point to a place upon the graduated rack'or graduated strip 11' somewhat above the graduation marked 5 truly the amount of discharge from the pump, it being remembered tha'tthe graduations are of a standard type. By the use of my invention the indicating point 14 upon .the pivoted indicator arm 13 may be caused to indicate accurately any amount of discharge from the pump regardless of variations in the internal dimensions of the pump chamber.

' Inexplaining the operation of this invention it will .be considered as predetermined that five gallons of fluid are to be and would not indicatev discharged from the pump and, for the pup pose of I convenience, the adjustable stop 35 is set in such position upon the rack 33 that the foot .36 upon the rack 10,will contact with the stop and limit the discharge from the pump when an even five gallons of liq- -uid has been dispensed. Considering the rack 10, then, as in the downward position shown in Fig. 1, power is applied to the driving shaft 17 and conveyed through the driving pinion 18 to the rack 10 tomove it upwardly and cause a discharge from the pump. The turning of the driving shaft 17 causes rotation of the train of gears 20, 21, 22 and 23"and consequent oscillation of the arm 24' and -shaft 25. The oscillation of the shaft 25 causes oscillation of the block 27 about the axis of the shaft 25 as a-center. If the internal dimensions of the ump chamber are standard the pin 31 is ad uSted within the block 27 to a point where its center is coaxial with the center of the shaft 25. In this position there is'no movement of the indicator arm 13 about its pivot 15 during the travel of the rack 10 and the oscillation of the block 27, and consequently the indicating point 14 remains stationary and registers with the graduation marked 5 upon the stri 11 when exactly five gallons of liquid has liieen dispensed from the pump.

If, however, the internal dimensions of the pump chamber are not standard and are, for instance, somewhat larger than standard the indicating oint 14, when an even five gallons of liquid has been dispensed from the pump, will point to a place upon the strip 11 somewhat above the graduation marked 5, as 15 shown in Fig. 5-1t being understood that the pin 31 and shaft 25 remain in the above described coaxial position. To correct this error in the indication made by the indicating point 14 and the graduated strip 11 a screw-driver is inserted in the slot of the traveling screw 30 and the screw is caused to travel outwardly from the axis of the shaft 25 to cause the pin 31 to stand in the position shown in Figs. 1 and 4. The distance of adjustment of the pin 31 is just suflicient to correct the error in registering illustrated in Fig. 5. Considering then that the chamber of the pump shown in Fig. 1 is slightly larger than standard, and considering further that the pin 31 has been adjusted to the position shown in Figs. 1 and 1, if power be applied to the driving shaft 17 and the rack 10 moved upwardly to discharge five allons of liquid from the pump, the block 2 will oscillate during the upward travel of the rack carrying the pin 31 from the position shown in Fig. 1 to the elevated position shown in Fig. 1. The oscillation of the block 27, in this adjusted position of the pin 31'will cause a rise of the pin 31 relatlvely to the center of theshaft 25, and this rise of the pin will cause a slight oscillation of the indicating arm 13 about its pivot 15 causing it to assume the position shown in Fig. 4'

wherein the indicating point 14 registers exactly with the graduation marked 5 upon the strip 11. If the internal dimensions of the pump chamber are somewhat less than standard, an adjustment of the pin 31 to a. position upon the opposite side of the axis of the shaft 25 will cause an upward move-- ment of the indicating point 14 to correctthe error which would obviously exist if the pin were left coaxial with the shaft 25.

Fig. 3 illustrates the position'of the parts there shown when the rack 10 and block; 27 are in the position .set forth in Fig. 1. Power may be. applied to the driving shaft 17' by any desirable means, such for instance, as .thehandled crank 39" shown in 2.

If my invention is incorporated with a machine other than the pump herein shown and described, slight variations in the dimensions or operation of parts in the other machinemay be corrected by adjustment of the pin 31 and consequent oscillation of the indicating point 11 to causeit to cooperate accurately at all times with the graduations of the graduated member upon the machine used.

In the accompanying drawings and in the foregoing description is set forth the preferred embodiment of my invention, but it is obvious that one skilled in the art may make modifications thereof without departing from the spirit of the invention.

I claim:

1. The combination with a machine, a part of which is moved by the operation of the machine and bears graduations, of a movable indicator arm operatively positioned with respect to the raduations, and mechanism actuated by t e machine for moving the indicator arm to cause it to register accurately with the graduations regardless of variations from standard of parts of the machine.

2. The combination with a macnine, of a movable part thereon bearing graduations moved by the operation of themachine, an

indicator arm operatively positioned with machine regardless of variations from standard of parts of the machine.

3. The combination witli a machine, of a reciprocating part moved by the machine bearing graduations spaced a standard distance' apart, a movable indicator arm operatively poitioned with respect to the graduations, andadjustable mechanism driven by the machine for moving the indicator arm to cause it to register accurately the work accomplished by the machine regardless of variation of parts of the machine from standard.

4. The combination with a pump,-of a movable part operated thereby bearing graduations, a movable indicator arm operatively positioned with respect to the gradu- .ations, and mechanism driven by the pump for moving the indicator arm to cause it to register-accurately the amount of discharge of the pump regardles of variations of the parts of the pump from standard.

5 The combination with apump, of a movable part thereon bearing graduations operated when the pump is actuated, a movable indicator arm operatively positioned with respect to the graduations, and mechanism driven by the pump for moving the indicator arm to cause it to register accurately the amount of discharge of the pump reduring the travel of the reciprocating part to compensate for variation from standard of the discharge capacity of the pump.

7. The combination with a pump, of driving mechanism therefor including a reciprocating member bearing graduations, an indicator arm operatively positioned with respect to the graduations pivoted intermediate its extremities to a fixed point upon the pump and provided with a longitudinal slot at one of its ends, a pin block pivoted intermediate its extremities for oscillation, a driving pin mounted upon the pin block, longitudinally adjustable thereon and engaging the slot of the indicator arm, and apparatus actuated by the driving'mechanism for oscillating the pin block during the travel of'the reciprocating member.

8. The combination of a pump, driving mechanism therefor including a reciprocating member bearing graduations, an indicator arm operatively positioned with respect to the graduations pivoted intermediate its extremities to a fixed point upon the pump and provided with a slot in one of its ends, a hollow pin block internally threaded provided with a longitudinal slot registering with the slot of the'indicator arm and pivoted' intermediate its extremities for oscillation in a plane parallel to the plane of oscillation o the indicator arm, a traveling screw engaging the internal threads of the pin block about its pivot, a sector gear upon screw protruding through the slot of the pin block and engaging the slotted end of the indicator arm, a lever for oscillating the pin block about its pivot, a sector gear upon the lever, and a train of reciprocating gears in mesh with the sector gear and connected with the driving mechanism for actuation thereby.

able indicator arm operatively positioned with respect to the graduations, and apparatus actuated by the driving mechanism for moving the indicator arm to cause it to indicate accurately the amount discharged from the pump regardless of variations from standard of apart of the pump.

11. The combination with a pump of a part bearing graduations moved by the operation of the pump, and compensating mdicator mechanism operated by the pump to indicate a necessary change of throw of the graduated part operated by the pump I from'the standard throw necessitated by the variation of the size of the pump cylinder from astandard size in order to pump the.

amount indicated on the graduated part as the standard amount.

'In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 3rd day of November, A. D. 1913.

ALLEN A. BOWSER. Witnesses: J. R. MA'rLAoK, L. W. THOMAS. 

